Iran is in the process of developing dangerous new cyber weapons following the discovery of state-sponsored attacks like Stuxnet on its networks.
Reuters reported that US general William Shelton warned the country had seen a marked increase in Iran's cyber capabilities following the 2010 discovery of Stuxnet.
"They are going to be a force to be reckoned with, with the potential capabilities that they will develop over the years and the potential threat that will represent to the US," Shelton said.
Shelton added the US government is in the process of creating a new cyber task force to react to the threat.
The general said that he is expecting orders to expand the country's cyber workforce of 6,000 staff by a further 1,000 people.
Stuxnet was malware believed to be created by the US. It was designed to sabotage Iran's nuclear programme and was unique in that it was a virus that could cause real world damage.
Since then more malware believed to be linked to the US government has been discovered.
Chief among them is the Flame malware. Flame was discovered in late 2012 and has been universally listed as a game-changer by numerous security experts due to its advanced cyber snooping capabilities.
Attacks on military networks are increasingly all the time with HP reporting last year that the US Navy's internal IT system is facing 110,000 cyber attacks every hour.